Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd56d7b0318fc26a…

MALICIOUS

PDF

77.0 KB Created: 2021-03-04 23:32:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 5a62fe88948387e579002a67cd2b2a25 SHA-1: fccf35de1b5b1583c218276adedc3f779e84b724 SHA-256: bd56d7b0318fc26ae484853678d2a36e5515a39de53d7c030efad63046034891
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains and redirectors, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lead users to malware or phishing sites. Although no scripts were extracted, the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/wix?keyword=infectonator+survivors+unblocked+at+school In PDF document text
    • https://cdn.sqhk.co/matijamaj/ggdgnjL/student_digest_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_603f16d55d603.pdfIn PDF document text
    • https://cdn.sqhk.co/zamepeja/hcGiiMf/66022828222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503787/normal_603aca8f33430.pdfIn PDF document text
    • http://italywow.pro/6321539073xov97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466679/normal_6020f9fd9e340.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5ff24e0525181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445749/normal_603cf2eb43517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417137/normal_5fdc61504f248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490542/normal_5fd0e6378b97b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420239/normal_5fce842fd53c8.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/tThi40r/lazadatazunopujimile.pdfIn PDF document text
    • http://winoorama.space/mobogenie_apk_iphoneh1z0w.pdfIn PDF document text
    • http://trokot-roznica.xyz/29534531482c9od8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fokapikow/64719200.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/2020_singapore_calendar_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/lofted_bend_solidworks_sheet_metal.pdfIn PDF document text
    • http://jajoxutevo.epizy.com/label_the_parts_of_a_microscope_answers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 5192 bytes
SHA-256: 678f4397567433770ebd2c58d428926c879a87529d7f983ddfd10f6be387ef01
font_01_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 10212 bytes
SHA-256: a459884eb1ebe7bf29d742d85d015941b336fa2cd1de816f3105ede350917856
font_02_sfnt_off000118d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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